Question 1028134
{{{S=159}}}
{{{A+159=180}}}
{{{A=21}}}
.
.
{{{A+C=90}}}
{{{21+C=90}}}
{{{C=69}}}
.
.
{{{11+2C=11+2*69}}}
{{{11+2C=11+138}}}
{{{highlight(11+2C=149)}}}